Strict Validation
The error message appears and the operation is cancelled.
Figure 1. Message: Operation not valid in context.
Validation On
The duplicate ID is inserted but a message reporting the duplicate ID appears .
You can click the message to call up the Attributes Dialog and correct the duplicate ID.
Figure 3. Correct the DITA ID in the Attributes dialog.
Validation Off
The duplicate ID is inserted without any messages.
To enable the validation of DITA IDs within a map, you must first specify the ID value of the map itself.